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handling forms and textbox for multiple button

Answer 1

A:

when I do request.getParameter("bid"), all I get is null...

Because it is not placed inside the same form. Just have it all in one form. To distinguish the button pressed, just give each the same name. Best way is to create a servlet which takes action accordingly based on the button pressed:

<form action="studentServlet" method="post">
    <input type="text" name="bid" />
    ...
    <input type="submit" name="action" value="Total Rent" />
    <input type="submit" name="action" value="Adviser Information" />
    <input type="submit" name="action" value="Delete Student" />
</form>

The com.example.StudentServlet class should look like:

package com.example;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class StudentServlet extends HttpServlet {

    private static final Map<String, String> pages = new HashMap<String, String>() {{
        put("Total Rent", "/WEB-INF/rent.jsp");
        put("Adviser Information", "/WEB-INF/adviser.jsp");
        put("Delete Student", "/WEB-INF/delete_std.jsp");
    }};

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
        String action = request.getParameter("action");
        String page = pages.get(action);
        request.getRequestDispatcher(page).forward(request, response);
    }

}

Map this servlet in web.xml on an url-pattern of /studentServlet (or so, at least the form action must point to it). The JSP pages are by the way located in /WEB-INF to prevent direct access without an intermediating Servlet.

This way you can in each of the JSP pages access the bid parameter by

<p>Your bid was ${param.bid}</p>

Hope this helps.

BalusC 2009-12-10 16:42:18

is there any other simpler way besides this? as I don't know what com.example.StudentServlet is....

Aditya H 2009-12-10 16:54:13

I want to use the request.getParamater("bid") in my jsp code not <p>Your bid was ${param.bid}</p>

Aditya H 2009-12-10 16:56:46

1) It is a Java class extending `javax.servlet.http.HttpServlet`. I've edited the code example to demonstrate more. 2) It does exactly the same, but then using Expression Language instead of the old fashioned scriptlets which is discouraged more than 10 years ago. I strongly recommend to go through a decent JSP/Servlet tutorial so that you get somewhere.

BalusC 2009-12-10 17:10:55

Answer 2

A:

sorry but I still wish to use getParameter

Aditya H. 2009-12-10 19:36:43

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handling forms and textbox for multiple button

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